<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <thead>
        <tr>
          <th>
            <input type="checkbox" v-model="isAll" />
            <span>全选</span>
          </th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <tr is="shop" v-for="(item, index) in goodList" :key="index" :item="item" @del="delFn" :index="index"></tr>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ allPrice }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>
<script>
import shop from "./components/购物车.vue"
export default {
  methods: {
    delFn(index) {
      this.goodList.splice(index, 1)
    },
  },
  computed: {
    allPrice() {
      return this.goodList.reduce((sum, obj) => {
        if (obj.checked === true) {
          sum += obj.num * obj.price
        }
        return sum
      }, 0)
    },
    isAll: {
      set(val) {
        this.goodList.forEach((obj) => (obj.checked = val))
      },
      get() {
        // every() 该函数所有一项返回true,则返回true。一旦有一项不满足则返回flase
        return this.goodList.every((obj) => obj.checked === true)
      },
    },
  },
  components: {
    shop,
  },
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    }
  },
}
</script>
